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Feasibility of improving cone-beam CT number consistency using a scatter correction algorithm.

Jun Li1, Weiguang Yao, Ying Xiao

  • 1Thomas Jefferson University. jun.li@jefferson.edu.

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|November 22, 2013
PubMed
Summary

Scatter correction algorithms significantly improve cone-beam CT (CBCT) number consistency. This enhancement is crucial for accurate density correction in CBCT imaging for radiation therapy planning.

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Area of Science:

  • Medical Physics
  • Radiological Imaging
  • Radiation Oncology

Background:

  • Cone-beam CT (CBCT) is increasingly used in radiation therapy for patient positioning and adaptive planning.
  • Accurate electron density information from CBCT is essential for dose calculation and treatment planning.
  • Inconsistency in CBCT numbers (Hounsfield units) can arise from scattered radiation, impacting density accuracy.

Purpose of the Study:

  • To evaluate the feasibility of a scatter-correction algorithm for improving CBCT number consistency.
  • To assess the impact of scatter correction on density accuracy for treatment planning applications.
  • To validate the algorithm's effectiveness on different CBCT imaging systems.

Main Methods:

  • A scatter-correction algorithm was implemented and applied to CBCT data acquired from Varian OBI and Elekta XVI systems.
  • CBCT images of phantom materials were acquired with and without a bolus to simulate increased scatter conditions.
  • CBCT numbers were compared between images with and without scatter correction processing.

Main Results:

  • CBCT numbers showed significant differences when a bolus was present, indicating increased scatter.
  • The application of the scatter-correction algorithm markedly reduced these differences.
  • Improved CBCT number consistency was observed across both tested CBCT systems after scatter correction.

Conclusions:

  • Scatter-correction algorithms are effective in enhancing CBCT number consistency.
  • This improvement facilitates the use of CBCT for accurate density-corrected treatment planning.
  • The developed scatter-correction method shows promise for clinical implementation in radiation therapy.